Phpml\Metric\ClassificationReport::getLabelIndexedArray PHP Method

    private static function getLabelIndexedArray(array $actualLabels, array $predictedLabels) : array
    {
        $labels = array_values(array_unique(array_merge($actualLabels, $predictedLabels)));
        sort($labels);
        $labels = array_combine($labels, array_fill(0, count($labels), 0));
        return $labels;
    }